<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- <div id="app">
        <h1>Hello,World</h1>
        <button @click="fn">逆转世界</button>
    </div> -->
    <!-- <div id="app">
        <h1>
          {{ msg }}
        </h1>
       <button @click="fn">
        {{ count }}
       </button>
      </div>
    <script src="../vue.js"></script>
    <script>
        // const app = new Vue(){
           
        // }
    const app = new Vue({
      el:'#app',
      data: {
        msg: 'Hello,World',
        count: '逆转世界'
      },
      methods: {
        fn(){
             
        }
      }
    })
  
    </script> -->
    <div id="app">
      <h1>{{ msg }}</h1>
      <button @click="msg=!msg">逆转世界</button>
    </div>
    <script src="./vue.js"></script>
    <script>
      const app = new Vue(
        {
        el: '#app',
        data: {
          msg: 'Hello,World',
        }
      }
      )
    </script>
</html>